feat: update cms case api

apps/case/models.py

@@ -1,10 +1,10 @@
 from django.db import models
-from apps.common.models import BaseModel
+from apps.common.models import BaseModel, SoftDeleteModel
 from apps.user.models import User
 
 
-class CaseBase(BaseModel):
-    """病例主表"""
+class CaseBase(SoftDeleteModel):
+    """病例主表（软删除：`is_deleted=1` 即「已下架」；`objects` 默认过滤已删）。"""
     CASE_TYPE_CHOICES = [
         ('traditional', '传统病例'),
         ('script', '剧本病例'),
@@ -15,10 +15,11 @@ class CaseBase(BaseModel):
         (0, '禁用'),
         (1, '正常'),
     ]
+    # 病例状态机：草稿 →[提交]→ 正常 →[医院管理员发布]→ 已发布；下架 = 软删除（is_deleted=1）
     PUBLISH_STATUS_CHOICES = [
         (0, '草稿'),
-        (1, '已发布'),
-        (2, '已下架'),
+        (1, '正常'),
+        (2, '已发布'),
     ]
 
     id = models.BigAutoField(primary_key=True)
@@ -26,6 +27,10 @@ class CaseBase(BaseModel):
     case_type = models.CharField('病例类型', max_length=30, choices=CASE_TYPE_CHOICES)
     difficulty = models.CharField('难度', max_length=20, blank=True)
     difficulty_score = models.IntegerField('AI难度评分', null=True, blank=True)
+    institution = models.ForeignKey(
+        'user.Institution', on_delete=models.SET_NULL,
+        null=True, blank=True, related_name='cases', verbose_name='所属机构'
+    )
     department = models.ForeignKey(
         'user.Department', on_delete=models.SET_NULL,
         null=True, blank=True, verbose_name='所属科室'